From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.210.176 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793330992; b=5aVYh6vTU9pvJVGlerkgZaXEwwd8GYgCh7ryZfL4U3SFvheTZsUxHIZ/PPAsfokQ5ETo YN9dqfsRGHXivTAWdX05O2Z85oqGLCkDb8kM/1y/ZZm2dG7OJry0zwhkKd0VD82BRIPF1 /bCICJ69jAhoId7Mvu4+Rta6tgwRt8IRdlHnVq3/VXDyV5k3+qWYsh/F0CjxM4sRaTwaG vBHzK8RJHLrAgJU+JKaNwBN3QXC6InQb+LtxVMgY4T2hlra+rUjtDahqbaLK7JeyS5FB3 UcqD+dByOX6BiEVHm94Wy6BeObbiN64pBN5TiS3E+DPj2Z12Fn6cdIwJCuaBcpxaKRg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793330992; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Gm-Message-State:X-Gm-Gg:X-Received:Received:From:To:Cc:Subject: Date:Message-Id:X-Mailer:MIME-Version:Content-Transfer-Encoding; bh=dahY9MpT6qRl250d4uUuF1qZsWTwuAAtLrsM4UyodQY=; b=mUFgcTZgsFn4kOC4Y7MjnmAjiYcmrr4fQX3TiidHBV+RNOKUG16xRciqn9jmO5vnFXbw 1RCih27it8ZSNWNJymcG9SjH+iNH5rh12QM+s1Xiit2E5q4iNsRzuS8wiMhWcufn1mxit p5SyhPR+5wnWgg8Gv28QZU0hmm7z5FHg4j7p41oVSPrbk+8nSaFgvBpWIvLaOtAmw7+xq 8xnFPXHzW5CZglHoo1UiL1sw/5BK0uFoWkC2Vt3rLgCQh6MU3jpMiMV9JVK4BFrZTJYX7 bO4oXtOlVkl9xuIf+74H6L0dX3yb+8IRKpA5qbII9QCuTyFGphAHOZ2x86PnWReqwWg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=K+jOzsvZ; arc=none smtp.remote-ip=209.85.210.176 Received: from mail-pf1-f176.google.com (mail-pf1-f176.google.com [209.85.210.176]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5F927606A32A for ; Fri, 30 Oct 2026 03:29:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 5F927606A32A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=K+jOzsvZ Received: by mail-pf1-f176.google.com with SMTP id d2e1a72fcca58-89f28c3ac7bso67759b3a.0 for ; Thu, 29 Oct 2026 20:29:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1793330992; x=1793935792; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=dahY9MpT6qRl250d4uUuF1qZsWTwuAAtLrsM4UyodQY=; b=K+jOzsvZ8fin3aq2OVYoARcSRIp4cKZM1dLjFNCiPZB3P8CvDLZQvCxwfrpNUPqWll yPhzZGmnQBxLkEdTB6YTG1dRqgAMlV3yDUX2z7sLf4/A3lJs+fUj1Gjx0J8CzNSvjHa2 /HJMIm5t1VpDT0X5dNFoGZKvXdJv6rcI7N0ayVH4viwXXpjWBQYW+kTlPyNEVURI92iR qYxXi6UENCEHwMJtubWtm5TrHBTzpDnKwZkjBd0P8mnHEUuIIM1qcOej6mBdk/ZKDMTT UkMerMaSwC8MmF6GhlSIcnfBv7ScFFacQdfwS7jQjwTwJyGoIP0yr3deSeFJha7k1Lli 9xCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793330992; x=1793935792; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=dahY9MpT6qRl250d4uUuF1qZsWTwuAAtLrsM4UyodQY=; b=VNId0YBawlajGZ2Y2bpySPX999QK1Ids7lO9XeLDd3EoGYxDoY4qCk7qxsUMjzF20L xBPVGc5o8OFXV6ZXlrm54jr+StlARV9EdGRoeNzvKSadZAPf3++rO6aRrsv2Cl9gg6OV T+tGoXWwWvqObOojVvN6oztp1dC4x57qFyqBmpahYwJ7dN2kLnTGEBFJHpxAYiVWGe32 P99lZy6cnDbLCPDDMjLwW4uN130nNjNprKiXnm/KoM7v0rzeuyoxNo/mEBWZUnR72hjE SRN5DRk9+UiWcp6qjC5HBVONHgiO+7G1AfendhJn90df2eGbSI8FgOY6RNRMGB2zpNGX yBbQ== X-Gm-Message-State: AFq9FYLG1Xf8hUPg1RqyEK6ieZeAeEzpvPjEiIV17VsuRP83eyimOgj9 G7JpTS52/Zx1+k943be2H5idUcYfBJK87305PbtEW9YNUU77cTJfxsK0 X-Gm-Gg: AYBFou08XILxyGRDAwZpYKsoswdBqG5bAbMJDruDayatOinlXxACAGMDHFGMX5pNea/ COaVgahaJNiMkPBj+OneSSjC09FanOQmjZP0gYlFAmMlvT9lTcXWCiB55iXpnCDYM6OP6USTjLV sRBRgKibeCPRuMZjx2dH8RP74Q9ELa+gEFn2UdTAZ+jHu139TnnFFauqV5n3mwZynehV8QCyLRK d5pb9oAFVzMO0o4CrfjL10EN+KOcwc3a8Rzi3CWBQL7rJydwZtuaSPwOqwjZmiwfcQTJpGemkxB JtKmoP94LOuLj1uYAPh3bAyepscYttlAz6SxRpUQWCn5ZBIY6yYllEgh77w5umuFl+2dIZAhFYq k4rcZypBIx9D6S8WTrc714fTw7ytOjoY/TZ+ABwicSdoSwUCfaC0Wy/dXq2VoZKsPzlYmnNsJsf bWKlHHG68rKlXR4tFg9LItKOyimwDp2mgfypWYXFX/ogTxmv0FKtSVTA5lcnR/PESg/rgofGxWx CseRPXT5GXhVwdpCzhh6KXCJHEoraYGlprYl3lI/tY7VlOWlCepV0R96LG99afUpx5RY2wNAZUj nIRjo+MdYB3ct2yS+oyT2HIW6Sueb2JwAoCcnEHILQjnDcvZKwqSOKJyGsqTnq0dPN4/8xurSJB hsQRMF79HLrSga8urwEySNjD1FfUSe2h+4Yla9xX4n5SKnKsrub8gVjbt1hEHKS9rY8oQZKtR X-Received: by 2002:a05:6a21:39a:b0:3e2:8fdc:a6c8 with SMTP id adf61e73a8af0-3e9290fd040mr1054244637.72.1793330991760; Thu, 29 Oct 2026 20:29:51 -0700 (PDT) Received: from localhost.localdomain (S0106e0dbd1c8af8c.vc.shawcable.net. [24.85.96.29]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cdb0981c5desm111713a12.27.2026.10.29.20.29.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 20:29:51 -0700 (PDT) From: Mahmoud Abumandour To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Mahmoud Abumandour Subject: [PATCH v2 0/2] KVM: nVMX: Don't let L2's LMSW modify CR0 bits owned by L1 Date: Thu, 29 Oct 2026 20:29:35 -0700 Message-Id: <20261030032937.2813-1-ma.mandourr@gmail.com> X-Mailer: git-send-email 2.40.1.windows.1 X-Mailing-List: kvm@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable When L2's LMSW exits to L0 but not to L1, KVM emulates it with=0D kvm_lmsw(), which ignores vmcs12's CR0 guest/host mask, so L2 can change=0D CR0 bits that L1 owns.=0D =0D v2:=0D - Patch 2: order the CR0 store before FNOP and check L2's whole CR0.=0D =0D v1: https://lore.kernel.org/all/20261029235040.12013-1-ma.mandourr@gmail.co= m=0D =0D Mahmoud Abumandour (2):=0D KVM: nVMX: Don't let L2's LMSW modify CR0 bits owned by L1=0D KVM: selftests: Verify that L2's LMSW leaves L1-owned CR0 bits alone=0D =0D arch/x86/kvm/vmx/vmx.c | 15 ++++++++=0D .../kvm/x86/nested_exceptions_test.c | 36 +++++++++++++++++++=0D 2 files changed, 51 insertions(+)=0D =0D =0D base-commit: dea4f6380f4ec96e8f3b0aaf2343764bd0d25ef4=0D -- =0D 2.25.1=0D =0D